A toy company wanted to see if people who purchased their train set were satisfied with it. They decided to send surveys to the first 1,500 people who bought the train set. What are the conditions of this sample?
The conditions of this sample are
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1. Random sampling: The company sent surveys to the first 1,500 people who bought the train set, which indicates a random selection of customers.
2. Size of the sample: The sample size is 1,500, which is a relatively large sample size and can provide a representative sample of customers who purchased the train set.
3. Self-selection bias: There may be a bias in the results if only satisfied or dissatisfied customers choose to respond to the survey, leading to potential self-selection bias.